Oxford Water Hardness & Quality Report (2026)

Oxford, Mississippi, in Lafayette County — the University of Mississippi (Ole Miss) home city, a vibrant north Mississippi university town on the Oxford Square, immortalized by William Faulkner as "Jefferson" in his fictional Yoknapatawpha County — receives its municipal water from the Oxford Water Department, which draws from Memphis Sand (Claiborne) Aquifer wells beneath Lafayette County. Oxford's groundwater supply is part of the massive Mississippi Embayment aquifer system underlying northern Mississippi.

The moderately hard 170 mg/L hardness and elevated TDS of 578 mg/L reflect deep aquifer circulation through the Claiborne Aquifer (the Memphis Sand unit of the Eocene Claiborne Group) beneath Lafayette County. The Claiborne aquifer is a thick, highly productive Eocene fine quartz sand formation interbedded with calcareous clay and marl layers — primarily a siliciclastic aquifer but one that has significant calcium carbonate and sulfate mineral content from residual Eocene marine carbonate and evaporite inputs preserved in the Mississippi Embayment sedimentary fill. Deep circulation of water through thousands of feet of these Eocene marine calcareous sands and clays over thousands of years progressively dissolves calcium, magnesium, and sulfate, producing the elevated hardness and TDS characteristic of deep Claiborne production wells in northern Mississippi.

At 170 mg/L, Oxford's water is moderately hard — consistent with the north Mississippi deep groundwater supply. Scale builds in kettles and coffee machines over months, dishwashers benefit from rinse aid, and bathroom fixtures develop calcium deposits. Quarterly descaling of heating appliances is the standard schedule. The PFAS level of 2.9 ppt is excellent — one of the best in the southern states dataset — reflecting Oxford's deep, confined aquifer supply, which is largely protected from surface-derived PFAS contamination by the thick overlying clay confining layers of the Mississippi Embayment sequence.